Simply Green

Due to I have a water softener, the company offered me "A Chemical Remover" rather a water softener and explain to me the Chemical Remover will remove the Sodium which are added by my water softener and tell me can pay off any time during pay rental time. After the free trail period, I received rental receipts which are indicated pay for water softener. I was shocked, why would I buy two water softener? So I called them asked return the machine. The Company tell me I can not return it because more than three monthes, I asked pay out, they ask $7000 dollars. Oh my god! A Water Softener is not more than $2000 they ask 3 times price. I really struggle and I don't know what can I do? If anyone can give me any suggestion or able to help me, I really appreciate!